PAGE\*MERGEFORMAT20PAGE\*MERGEFORMATI水杨酸对NaCl胁迫下百日草幼苗生长的影响颜培涵目录TOC\o"1-2"\u摘要PAGEREF_Toc32764240\hIAbstractPAGEREF_Toc32764241\hII前言PAGEREF_Toc32764242\h11.材料与方法PAGEREF_Toc32764243\h21.1试验材料PAGEREF_Toc32764244\h21.2试验方法PAGEREF_Toc32764245\h21.3项目测定PAGEREF_Toc32764246\h21.4数据分析PAGEREF_Toc32764247\h32.结果与分析PAGEREF_Toc32764248\h32.1不同浓度SA对NaCl胁迫下百日草幼苗株高的影响PAGEREF_Toc32764249\h32.2不同浓度SA对NaCl胁迫下百日草幼苗鲜重、干重的影响PAGEREF_Toc32764250\h42.3不同浓度SA对NaCl胁迫下百日草幼苗根系形态的影响PAGEREF_Toc32764251\h52.4不同浓度SA对NaCl胁迫下百日草幼苗不同径级根系参数的影响PAGEREF_Toc32764252\h73.结论与讨论PAGEREF_Toc32764253\h83.1结论PAGEREF_Toc32764254\h83.2讨论PAGEREF_Toc32764255\h8参考文献PAGEREF_Toc32764256\h11致谢PAGEREF_Toc32764257\h13摘要为探讨外源水杨酸（SA）对NaCl胁迫下百日草幼苗生长的影响，以梦境百日草为试验材料，采用温室盆栽试验的方法，在100mmol/LNaCl胁迫处理下，研究不同浓度（0mmol/L、0.5mmol/L、1.0mmol/L和1.5mmol/L）SA对NaCl胁迫下百日草幼苗生长的影响。结果表明：NaCl胁迫下，百日草幼苗的株高、鲜重、干重、根系总根长及细根（0-0.3mm）根长均不同程度的降低，外施SA后各项指标均随SA浓度的增加呈现出先上升后下降的趋势。其中0.5mmol/LSA处理的各项指标均达到最大值，且显著高于对照；而1.0mmol/LSA处理与对照相比差异不显著；1.5mmol/LSA处理后各项指标均显著低于对照。综合来看，外施0.5mmol/LSA时百日草幼苗生长最好，可有效缓解百日草的NaCl胁迫。关键词：百日草；水杨酸；NaCl；生长AbstractInordertoexploretheeffectofexogenoussalicylicacid(SA)ongrowthofZinniaelegansunderNaClstress,dreamlandZinniaeleganswasusedastheexperimentalmaterialandgreenhousepottedexperimentwasconducted.Under100mmol/LNaClstress,theeffectsofdifferentconcentrationsofSA(0mmol/L,0.5mmol/L,1.0mmol/Land1.5mmol/L)onthegrowthofZinniaelegansunderNaClstresswerestudied.TheresultsshowedthatunderNaClstress,theplantheight,freshweight,dryweight,totalrootlengthandfineroot(0-0.3mm)lengthofZinniaelegansseedlingsalldecreasedtodifferentdegrees.AllindexesshowedatendencyofincreasingfirstandthendecreasingwithSAlevelrisingafterexternalapplicationofSA.AllindexesreachedthemaximumvaluewhentheconcentrationofSAwas0.5mmol/L,whichwassignificantlyhigherthanthecontrolgroup.WhentheconcentrationofSAwas1.0mmol/L,thedifferencewasnotsignificant.Whentheconcentrationof